diff --git a/mptcp/files/usr/share/omr/post-tracking.d/post-tracking b/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
index 71dd7f0ac..9c3a19fb0 100755
--- a/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
+++ b/mptcp/files/usr/share/omr/post-tracking.d/post-tracking
@@ -210,14 +210,14 @@ set_routes_intf6() {
 				weight=1
 			fi
 			if [ "$multipath_config_route" = "backup" ]; then
-				nbintfb=$((nbintfb+1))
+				nbintfb6=$((nbintfb6+1))
 				if [ -z "$routesintfbackup6" ]; then
 					routesintfbackup6="nexthop via $interface_gw dev $interface_if weight $weight"
 				else
 					routesintfbackup6="$routesintfbackup6 nexthop via $interface_gw dev $interface_if weight $weight"
 				fi
 			else
-				nbintf=$((nbintf+1))
+				nbintf6=$((nbintf6+1))
 				if [ -z "$routesintf6" ]; then
 					routesintf6="nexthop via $interface_gw dev $interface_if weight $weight"
 				else
@@ -304,10 +304,10 @@ set_route_balancing6() {
 				weight=1
 			fi
 			if [ "$multipath_config_route" = "backup" ]; then
-				nbintfb=$((nbintfb+1))
+				nbintfb6=$((nbintfb6+1))
 				routesbalancingbackup6="$routesbalancingbackup6 nexthop via $interface_gw dev $interface_if weight $weight"
 			else
-				nbintf=$((nbintf+1))
+				nbintf6=$((nbintf6+1))
 				routesbalancing6="$routesbalancing6 nexthop via $interface_gw dev $interface_if weight $weight"
 			fi
 		fi
@@ -369,13 +369,13 @@ set_server_all_routes6() {
 	if [ "$serverip" != "" ] && [ "$OMR_TRACKER_DEVICE_GATEWAY6" != "" ] && [ "$multipath_config_route" != "off" ] && [ "$interface_up" = "true" ]; then
 		routesintf=""
 		routesintfbackup=""
-		nbintf=0
-		nbintfb=0
+		nbintf6=0
+		nbintfb6=0
 		config_load network
 		config_foreach set_routes_intf interface
 		uintf="$(echo $routesintf | awk '{print $5}')"
 		uintfb="$(echo $routesintfbackup | awk '{print $5}')"
-		if [ -n "$routesintf" ] && ([ "$nbintf" -gt "1" ] && [ "$(ip -6 r show $serverip metric 0 | tr -d '\t' | tr -d '\n')" != "$serverip $routesintf " ]) || ([ "$nbintf" = "1" ] && [ "$(ip -6 r show $serverip metric 0 | grep $uintf)" = "" ]); then
+		if [ -n "$routesintf" ] && ([ "$nbintf6" -gt "1" ] && [ "$(ip -6 r show $serverip metric 0 | tr -d '\t' | tr -d '\n')" != "$serverip $routesintf " ]) || ([ "$nbintf6" = "1" ] && [ "$(ip -6 r show $serverip metric 0 | grep $uintf)" = "" ]); then
 			while [ "$(ip -6 r show $serverip | grep -v nexthop | sed 's/ //g' | tr -d '\n')" != "$serverip" ] && [ "$(ip -6 r show $serverip | grep -v nexthop | sed 's/ //g' | tr -d '\n')" != "" ]; do
 				ip -6 r del $serverip
 			done
@@ -383,8 +383,8 @@ set_server_all_routes6() {
 			ip -6 route replace $serverip scope global $routesintf
 			[ "$(uci -q get openmptcprouter.settings.debug)" = "true" ] && _log "New server route is $(ip -6 r show $serverip metric 0 | tr -d '\t' | tr -d '\n')"
 		fi
-		if [ -n "$routesintfbackup" ] && ([ "$nbintfb" -gt "1" ] && [ "$(ip -6 r show $serverip metric 999 | tr -d '\t' | tr -d '\n')" != "$serverip $routesintfbackup " ]) || ([ "$nbintfb" = "1" ] && [ "$(ip -6 r show $serverip metric 999 | grep $uintfb)" = "" ]); then
-			[ "$(uci -q get openmptcprouter.settings.debug)" = "true" ] && _log "Set server $server ($serverip) backup default route $serverip $routesintfbackup nbintfb $nbintfb $OMR_TRACKER_DEVICE"
+		if [ -n "$routesintfbackup" ] && ([ "$nbintfb6" -gt "1" ] && [ "$(ip -6 r show $serverip metric 999 | tr -d '\t' | tr -d '\n')" != "$serverip $routesintfbackup " ]) || ([ "$nbintfb6" = "1" ] && [ "$(ip -6 r show $serverip metric 999 | grep $uintfb)" = "" ]); then
+			[ "$(uci -q get openmptcprouter.settings.debug)" = "true" ] && _log "Set server $server ($serverip) backup default route $serverip $routesintfbackup nbintfb $nbintfb6 $OMR_TRACKER_DEVICE"
 			ip -6 route replace $serverip scope global metric 999 $routesintfbackup
 		fi
 	fi
@@ -796,6 +796,7 @@ if [ "$multipath_config" = "master" ]; then
 			routesbalancing=""
 			routesbalancingbackup=""
 			nbintf=0
+			nbintf6=0
 			config_load network
 			config_foreach set_route_balancing interface
 			config_foreach set_route_balancing6 interface
@@ -806,7 +807,7 @@ if [ "$multipath_config" = "master" ]; then
 				}
 			}
 			[ -n "$routesbalancing6" ] && {
-				([ "$nbintf" -gt "1" ] && [ "$(ip -6 r show default metric 1 | tr -d '\t' | tr -d '\n')" != "default via $routesbalancing6 " ]) || ([ "$nbintf" = "1" ] && [ "$(ip -6 r show default metric 1 | grep $OMR_TRACKER_DEVICE)" = "" ]) && {
+				([ "$nbintf6" -gt "1" ] && [ "$(ip -6 r show default metric 1 | tr -d '\t' | tr -d '\n')" != "default via $routesbalancing6 " ]) || ([ "$nbintf6" = "1" ] && [ "$(ip -6 r show default metric 1 | grep $OMR_TRACKER_DEVICE)" = "" ]) && {
 					_log "Set ip -6 route replace default scope global metric 1 $routesbalancing6"
 					ip -6 route replace default scope global metric 1 $routesbalancing6
 				}
@@ -818,7 +819,7 @@ if [ "$multipath_config" = "master" ]; then
 				}
 			}
 			[ -n "$routesbalancingbackup6" ] && {
-				([ "$nbintf" -gt "1" ] && [ "$(ip -6 r show default metric 999 | tr -d '\t' | tr -d '\n')" != "default via $routesbalancingbackup6 " ]) || ([ "$nbintf" = "1" ] && [ "$(ip -6 r show default metric 999 | grep $OMR_TRACKER_DEVICE)" = "" ]) && {
+				([ "$nbintf6" -gt "1" ] && [ "$(ip -6 r show default metric 999 | tr -d '\t' | tr -d '\n')" != "default via $routesbalancingbackup6 " ]) || ([ "$nbintf6" = "1" ] && [ "$(ip -6 r show default metric 999 | grep $OMR_TRACKER_DEVICE)" = "" ]) && {
 					_log "Set backup ip -6 route replace default scope global $routesbalancingbackup6"
 					ip -6 route replace default scope global metric 999 $routesbalancingbackup6
 				}